- 3M
- AAF
- ABB Turbo Systems AG
- ABD
- Accenture (Andersen Consulting)
- Actuant Corporation
- AE Clevite
- Affinia Group
- Afton Chemical
- Aggreko
- Aisin
- Alcoa
- Alfa Laval
- Alliance Bernstein
- Allison Transmission
- Alstom, Inc.
- American Axle & Manufacturing
- American Boa
- American Cooling
- American Iron & Steel Institute
- American Power
- Amyris
- API Heat Transfer
- Aragosta Partners Ltd.
- Arthur D. Little
- ArvinMeritor
- ASCO Power Technologies
- Ashok Leyland
- AT Kearney
- Auto Strategies International
- Autocam Corporation
- Automotive Aftermarket Industry Assoc.
- Automotive Report
- AVL Powertrain Engineering
- BAE Systems
- Bain and Company
- Baldwin Filters
- Ballard Power Systems
- Barber Colman
- BASF Catalysts
- Battery Council International
- Baudouin Moteurs
- Bechtel
- Behr GmbH
- Bekaert Corporation
- Bendix
- Berg
- Bernard
- BMW Motoren
- Boer and Croon
- Bohler
- Bomag
- Bombardier Inc.
- Booz & Company
- Borg Warner, Inc.
- Boston Consulting Group, Inc.
- Bowman Power Systems
- BP Castrol
- Briggs & Stratton
- Britax
- Brunswick Corporation
- Buck's Engines
- Bundy International
- Burgess-Norton Mfg. Co.
- C.E. Niehoff and Co.
- California Air Resources Board
- Calnetix
- Capstone Turbine Corporation
- Carborundum
- Carlisle Belts
- Carlisle Consulting
- Caterpillar
- CCC
- CenterPoint Energy Minnegasco
- CERx
- CETA
- CHAMP Ventures
- Champion Parts, Inc.
- Chevron
- China Diesel
- CIFUNSA Diesel SA de CV
- Cincinnati Lamb
- CitiGroup
- Claas
- Clarcor
- Clean Diesel Technolgies, Inc.
- Club Car
- Clymer
- CNH
- Coleman Powermate
- Collier Technologies Inc.
- ColTec
- Concentric
- Consolidated Metco Inc.
- Construction Industry
- Continental Automotive
- Conti-Temic
- Cooper Compression
- Cooper Industries
- Corning, Inc.
- CR Industries
- Credit Suisse
- CSM
- CTS Automotive
- Cummins, Inc.
- CVG
- CVT Corp.
- Cycle-Tec Ltd.
- D-A Lubricant Company, Inc.
- DAB Industries
- Daewoo Motors Ltd.
- DAF Trucks
- Daihatsu Motor Corporation
- DaimlerChrysler
- Dana Corporation
- Darchem Engineering
- DATCON
- DEA
- Deere & Co.
- DEIF
- Delphi Corporation
- Denso
- Detroit Diesel Corporation
- Deutz AG
- Diesel Kiki
- Dipaco
- Discom
- Dofasco
- Donaldson Company, Inc.
- Dow Automotive
- Dresser-Rand
- DuPont
- Dura Automotive Systems
- Durr
- DynaGen Technologies
- Dynalco Controls
- E.J. McKay and Co., Inc.
- E4Tech
- Easton Consultants
- Eaton Corporation
- ECG Consulting
- Eclipse Manufacturing
- Ecolab Inc.
- EcoMotors
- EEA
- Electrabel
- Elkamet
- Elliott Power Systems
- Emcon Tech
- Engelhard Corporation
- Enhanced Turbine
- Environ
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- Envisioneering
- Equity
- ERG
- Estin & Co.
- ESW
- European Environment Agency
- ExxonMobil
- Facet Enterprises, Inc.
- Fairbanks Morse Engine
- Federal-Mogul Corporation
- FEV
- Fiat Powertrain
- Fincantieri
- Finmeccanica Inc.
- Firestone Industrial Products
- Fleetguard
- Ford Motor Company
- Foton Lovol
- FPT
- FRAM
- Frank Lynn Assoc.
- Franklin Fuel Cells, Inc.
- Freightliner LLC
- Freudenberg and Co.
- Frost & Sullivan
- Fuld and Company, Inc.
- Furon
- FW Murphy
- Garlock Equipment Company
- GE Aviation
- GE Jenbacher AG
- GE Power Systems
- GE Transportation Systems
- Gem Products, Inc.
- Generac Power Systems
- General Engine
- Geo2
- Geometric Results, Inc.
- Gerhardts
- Giesse SRL
- GKN
- Global Power
- GM Powertrain
- Goldman Sachs
- Greenhill
- Grundfos
- Gulf Western Oil
- Haldex Group
- Halliburton
- Hamilton Sundstrand
- Hatz GmbH
- Hawthorne Power Systems
- Heavy Duty Holdings LLC
- Hella
- Hendrickson
- Henkel Corporation
- Hercules Incorporated
- HighwayMaster Corporation
- Hilite International
- Hilty Moore
- Hino Motors, Ltd.
- Hitchcock Industries, Inc.
- Hoeganaes Corporation
- Honda Motor Company
- Honeywell Turbo Technologies
- Horton, Inc.
- Huf North America
- Hunter Industries
- Husqvarna Turf Care
- IBI Consulting
- ICF Consulting
- IHI
- IMPCO Technologies
- INFINEUM
- Ingersoll-Rand Co.
- InterFace
- Investment Service
- IPD LLC
- Isringhausen
- Isuzu
- ITW Produx
- Iveco
- J.D. Power
- J.P. Industries
- Jack Faucett Associates, Inc.
- Jacobs Vehicle System
- JD OEM
- John Crane, Inc
- Johnson Controls
- Johnson Matthey
- JP Morgan
- J-W Operating Company
- Kadmus
- Kaiser and Associates
- Karl Dungs
- Kawasaki
- Keihin Fuel Systems
- Key Safety
- Kioti Tractor
- Kirloskar Group
- Knibb Gormezano and Partners
- Knite, Inc.
- Knorr-Bremse
- Kohler Company
- Komatsu
- KS Kolbenschmidt
- Kubota Corporation
- Kysor Cadillac
- Laborde
- Lazard
- Leece Nevillel
- Lister-Petter
- Lloyd's Register
- Lockheed Martin Corporation
- Lombardini Motori S.p.A.
- Long Manufacturing
- Lord Corporation
- Louisville Forge
- Lubrizol Corporation
- LuK
- Luzuriaga
- M & H
- Mack Trucks, Inc.
- Maerkisches Werke
- Magna Powertrain
- Mahle Group
- MAN Group
- Mann + Hummel Group
- Marathon Electric, Inc.
- Mark IV Automotive
- Marubeni Corporation
- McCaffery & Co.
- McKinsey & Co.
- Melex
- Mercer
- Mercury Marine
- Meridian
- Merrill Lynch
- Metaldyne
- Milwaukee Wire Products
- Mitsubishi Electric
- Mitsubishi Heavy Industries, Ltd.
- Morgenthaler
- Motiva Enterprises LLC
- Motorola
- MSI
- MTS Systems Corporation
- MTU Friedrichshafen
- Multiquip
- Murray, Inc.
- MWM
- Nanni Diesel
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- Napier
- National Biodiesel Board
- National Renewable
- Navigant
- Navistar International
- Nelson Industries
- New Holland
- NGK Automotive Ceramics
- NGK- Locke, Inc.
- Nissan
- Northern Lights
- Notox
- Nova
- Novariant
- NPR
- NSG
- NxtGen
- Oliver Wyman
- PACCAR
- Pacific Gas and Electric Company
- Palmer PR
- Parker Hannifin Corporation
- PBS Turbo s.r.o
- Pennzoil
- Perkins Engines Company Ltd.
- Petro-Canada
- Phillips and Temro Industries
- Polaris Industries
- Pollack
- Pramac Group
- Pratt and Whitney
- Prevost
- PricewaterhouseCoopers
- ProezaGrede
- PSA
- Purolator
- PWC
- R H Sheppard
- Ransomes Jacobsen Ltd.
- Reinjjes
- Reiter
- Remy International
- Renault
- Renk AG
- Ricardo plc
- Robert Bosch GmbH
- Rockwell Automation
- Roland Berger
- Rolls-Royce
- Rotary Power
- Saleh & Abdulaziz
- San Luis Rassini
- Sauer Sundstrand
- Sauer-Danfoss, Inc.
- Scania
- Schaeffler
- Schlegel
- Schlumberger
- Scuderi Group
- Sensata Technologies
- SEPCO
- SFA Ltd
- SGL Carbon
- Siegel-Robert, Inc.
- Siemens AG
- SIPC
- SOE Technology
- Solar Plastic
- Solar Turbines Inc.
- Solideal
- Southwest Research Institute
- Spartanburg
- Spectra Premium Industries
- SRI International
- St. Gobain
- Stahl International
- Stanadyne
- Standard Aero
- Stax
- Stewart and Stevenson Services, Inc.
- Stirling Power Systems
- Stork
- Strategies Unlimited
- Strattec
- Sulzer Metco
- Sumitomo
- Sundelius
- Sunpower, Inc.
- Superior Industries
- Suzuki Motor Corporation
- Synchro-Start
- Tecumseh Products Company
- Teledyne Technologies
- Teleflex
- Tennant Company
- Tenneco
- Terex
- Texas Engine Exchange
- Textron Inc.
- The Toro Company
- Thermatrix, Inc.
- Thermo Electron Corporation
- Thermo King
- Thermopol Limited
- ThyssenKrupp
- Tianjin Lovol
- Tiax LLC
- Timken Corporation
- Tognum
- Toyota Motor Co.
- TRG
- TriMark
- Truflow
- TRW
- TUPY
- Tuthill Drive Systems
- Tyco Electronics
- UBS
- Umicore Catalysts
- Unifrax
- United Technologies Corporation
- Universal Coach
- US Department of Energy
- US Environmental Protection Agency
- Valeo
- Vapor Corporation
- Varnay
- VARTA
- Visteon Corporation
- VM Motori S.p.A.
- Volkswagen AG
- Volvo Penta
- Volvo Trucks
- W.R. Grace and Co.
- Walker Manufacturing Company
- Waller Marine, Inc.
- Wartsila Diesel
- Waste Management
- Watlow Electric
- Webasto
- Westport
- Wheeler Machinery Co.
- Wix Filtration
- Wolff Controls
- Wood Group
- Woodward Governor Company
- Yamaha Motors
- Yanmar Diesel
- Yazaki
- Young Touchstone
- ZF Group
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